Frost dates for 94591 — Vallejo, CA
Frost is light and occasional here — typically a few cold nights around midwinter (about 5 a year). Cover tender plants when frost is forecast.
How Vallejo compares
- In a typical year, frost nights in Vallejo fall between December 27 and January 17. In 1 year in 10 the first frost comes as early as December 4, or the last frost as late as March 4.
- Compared with Concord, CA, 23 km away, the last frost here is 8 days later than there.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | December 23 |
| 50% (median) | January 17 |
| 10% (safe for tender plants) | March 4 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | December 4 |
| 50% (median) | December 27 |
| 90% (late) | February 4 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Gardening where frost is rare
Vallejo, CA only freezes on a few winter nights, so the usual "plant after the last frost" rule doesn't apply. Heat and rainfall decide the seasons instead:
- Cool-season crops (lettuce, broccoli, peas, carrots) grow best from fall through late winter.
- Warm-season crops (tomatoes, peppers, beans, squash) do best planted in late winter to spring, and again in late summer for a fall crop — midsummer heat can stop tomatoes setting fruit.
- Heat lovers (okra, sweet potatoes, melons) can be planted through spring and early summer.
About these dates
Based on 1991–2020 NOAA climate normals for the Vallejo, CA weather station, 2 km away (elevation 341 ft (104 m)).
ZIP codes in Vallejo: 94589 94590 94591 94592
Frost dates near Vallejo
- Crockett Jan 17 · Dec 27
- Benicia Jan 17 · Dec 27
- Port Costa Jan 17 · Dec 27
- American Canyon Mar 5 · Nov 21
- Rodeo Jan 17 · Dec 27
- Hercules Jan 17 · Dec 27
- Pinole Jan 4 · Jan 2
- Martinez Feb 28 · Nov 22
Frequently asked questions
When is the last frost in Vallejo, CA?
The median last spring frost in Vallejo, CA is January 17. There is still about a 10% chance of frost after March 4, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Vallejo, CA?
The median first fall frost is December 27, with about a 10% chance of frost before December 4.
How long is the growing season in Vallejo, CA?
About 344 days between the median last spring frost and first fall frost.
What planting zone is Vallejo, CA?
Vallejo, CA is in USDA hardiness zone 9b.